You need to specify Top Object, object and property and any number of optional parameters. If you want to save property for activity you need a_id to identify activity

required parameters
(ob_top_id or ob_top_name) to specify Top Object and (ob_id or ob_name) to specify child object and (pr_name or pr_id) to specify property
optional parameters
a_id - to access activity property and new_pr_name (new name for existing property)  prl_id or prl_name and prle_code (it is required if pr_type=list, prl_id and prl_name to find list, prle_code to find list entry) pr_postfix, pr_icon_type, pr_icon_color, pr_seq_num, pr_value=( value of the property, will be calculated by server if pr_type==list and prl_id or prl_name and prle_code is provided)
response format
parameter reference

ob_top_id – Top Object id, unique

ob_top_name – Top Object name, not unique

ob_id – object id, unique

ob_name – object name, unique across project

pr_id – property id, unique

pr_name – property name, not unique

a_id – activity id to modify activity property

pr_multilang – create multilang property name

pr_en_name – English property name

pr_dk_name – Danish property name

pr_pl_name – Polish property name

pr_ro_name – Romanian property name

pr_type – property type, allowed values: string, date, decimal, list

pr_subtype – id of property list, if pr_type is list, otherwise empty

prl_id – id of the property list

prl_name – name of the property list

prle_code – code of the entry in property list

pr_value – value of the property, if pr_type is list this is calculated based on prl_id or prl_name and prle_code

pr_postfix – suffix added after property value

pr_seq_num – order id, lowest id are displayed at the top of the list

pr_icon_type – icon used for property, string allowed values are described here

pr_icon_color – color of the icon, allowed values are: (“#3F77AF”,”#57AA88″,”#E9B56B”,”#CA4A36″,”#676767″,”#854EA2″)

pr_text1… pr_text5 – text fields not used in Catchr application, but can be set and retrieved via REST API